The pair of metals refined by "vapour phase r | vedclass

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(C) Vapour phase refining involves the conversion of a metal into a volatile compound,which is subsequently decomposed to obtain the pure metal.$1$. N

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$Zr, Ni$

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(C) Vapour phase refining involves the conversion of a metal into a volatile compound,which is subsequently decomposed to obtain the pure metal.$1$. Nickel is purified by the Mond process: Impure nickel is heated in a stream of carbon monoxide to form a volatile complex,$Ni(CO)_4$,which is then decomposed to obtain pure nickel.$Ni + 4 CO$ $\xrightarrow{350 \ K} Ni(CO)_4$ $\xrightarrow{470 \ K} Ni 	ext{ (pure)} + 4 CO$$2$. Zirconium is purified by the Van Arkel method: Zirconium is heated in iodine vapours to form a volatile complex,$ZrI_4$,at $870 \ K$,which is further decomposed to obtain pure metal.$Zr + 2 I_2$ $\xrightarrow{870 \ K} ZrI_4$ $\xrightarrow{1800 \ K} Zr 	ext{ (pure)} + 2 I_2$Thus,the pair of metals refined by this method is $Zr$ and $Ni$.

The pair of metals refined by "vapour phase refining" is

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